Fig. 1. Devices and components for the smartphone-based computer-assisted semen analysis (CASA) system. (A) Photo of the SEEM® kit with instructions for use, sperm analysis device, semen transfer device, QR code sheet to download the application for operating, and disposable built-in counting chamber with objective lens and cover glass. (B) The technique for observing the semen sample using smartphone-based CASA. After a drop of semen (black arrow) is placed under the covered glass of the built-in sperm-counting chamber, the black-colored lens portion of the chamber is put on the front lens of the smartphone. (C) Sample screenshot of the captured test results of a semen sample with concentration and motility.